Thanks properlypurple for your ideas. Yes we did try de-activating all plug-ins and working on theme only, but this did not help.
We also tried an alternative WP theme, again without plug-ins and this did not work either.
Our site should still not be active yet but notice it is, something to correct.
We will try as you suggest with healthcheck plug-in. We do note that console log has various faults that might be related to cookies and content blocking using Mozilla Firefox. Something else to check.
The theme edit/customise function appears to work ok using an Apple computer.
Thanks again.
